Abstract
Senescence in carnations (Dianthus caryophyllus L. cv. Scania) comprises two phases. The first phase is characterized by active proteolysis and a moderate exudation of electrolytes. These changes are apparently reversible. Exogeneous glucose prolongs this phase. The second phase is preceded by a burst of ethylene, and rapidly leads to death. The changes observed, primarly in membrane permeability and proteolysis, are under the control of a process whose mechanism remains unknown, but which is marked at the cellular level by a lack of energy. Some phenomena of the senescence syndrome can be detected at the time of flower opening, so that withering is only the last phase of an aging process that begins very early.
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